Systole
The cardiac phase of ventricular contraction
Definition
Systole is the phase of the cardiac cycle during which the ventricles contract, ejecting blood into the aorta and pulmonary arteries. Corresponds to the 'top number' of blood pressure.
Systolic Blood Pressure
- Normal: less than 120 mmHg
- Elevated: 120 to 129
- Stage 1 HTN: 130 to 139
- Stage 2 HTN: ≥ 140
- Hypertensive crisis: greater than 180
Systolic Heart Failure
Reduced ejection fraction (HFrEF, EF ≤ 40%). Heart cannot contract forcefully enough. Treatment: ACE inhibitors/ARBs, beta-blockers, spironolactone, SGLT2 inhibitors, diuretics.
Nursing Considerations
Monitor BP trends. Recognize systolic hypertension as cardiovascular risk. Manage systolic heart failure with guideline-directed therapy, daily weights, sodium restriction.
NCLEX Relevance
Know BP ranges and heart failure classifications.